Some media queries are removed with keepAtRules

[lubomirblazekcz]

This gets removed (should work too)

@media not all and (min-width:640px) {
  .container {
    width: 100% !important;
    min-width: 100% !important
  }
}

@media not all and (width >= 640px) {
  .container {
    width: 100% !important;
    min-width: 100% !important
  }
}

This works

@media (max-width:640px) {
  .container {
    width: 100% !important;
    min-width: 100% !important
  }
}

@media (width <= 640px) {
  .container {
    width: 100% !important;
    min-width: 100% !important
  }
}